Dip leg water/liquid seal arrangement

The purpose of a liquid (commonly water) seal drum in a flaregas system is threefool:-

• It operates as a non-return device preventing interaction from the outlet to the inlet of the drum.
• It operates as an upstream pressure relief value preventing gas flow from the inlet to the outlet until a particular upstream pressure, frequently predetermined is reached.
• It acts as a diversionary unit for:- Ground flare to evelated flare systems; Ground Flare to ground flare systems; Fuel gas recovery systems to evelated flare. 

• Designed to prevent pulsing of the gas flow to the flare.
• Ensures totally safe flare operation. Can be designed to accomodate a future fuel gas recovery scheme.
• Cost savings for fuel gas recovery installation.